government that is representative and accountable to the iraqi people. >> reporter: even when a iraqi government takes shape, president obama promised the u.s. government wouldn't just walk away. >> our combat mission is ending but our commitment to iraq's future is not. >> reporter: that commitment has come with a heavy price. nearly $1 trillion spent and more than 4,000 lives lost. tara mergener for cbs news, washington. u.s. investigators are looking into whether two men arrested in amsterdam were conducting a dry run for a potential terrorist attack. the suspects were taken into custody when their flight landed in amsterdam. u.s. officials flagged dutch authorities after discovering suspicious items in one of the suspect's bags, which were mistakenly shipped to dulles airport. screeners found several cell phones and blackberries, one taped to a pepto-bismol bottle.